It is best to try and ween your bichirs off of live feeders IMO, feeders are not a good source of nutrition for any fish and your bichir will be healthier on a diet of meaty frozen foods (fish,cockles,mussels ect) worms (bloodworms and earthworms) shrimp (live or uncooked fresh/frozen) and pellets intended for carnivorous fish.
I have 3 species of bichir and i too only feed them 3 times a week (under 10" i fed them everyday).With any predatory fish it is best to only feed 2 or 3 times a week,feed them as much as they can eat in about 5 minutes (so their stomachs are noticably rounded) and then let them take at least 48 hours to digest the meal.By feeding again too early it may cause the fish to regurgitate some of the last meal which can seriously affect bacteria colonies within the filter.
I have 3 species of bichir and i too only feed them 3 times a week (under 10" i fed them everyday).With any predatory fish it is best to only feed 2 or 3 times a week,feed them as much as they can eat in about 5 minutes (so their stomachs are noticably rounded) and then let them take at least 48 hours to digest the meal.By feeding again too early it may cause the fish to regurgitate some of the last meal which can seriously affect bacteria colonies within the filter.